stanbrough



l (No'Model.)

` R. G. STANBROUGH.

' A DENTAL DISKAND M RFJER.y N0.'503,258.` Patented Aug. 15, 1893.

UNITED STAT-Es PATENT @EnronC RUFUS Gr.V STANBROUGH, OF NEW YORK, N. Y.

DENTAL nlspK AND cARRuaR.

SPECIFICATION forming part 0f Letters Patent. No. 503,258, dated August15, 1893.

Application h'led January 29, 1892. Renewed January 18, 1893. Serial No.458818. (No model.)

.T0 all whom it may concern:

Beit known that I, RUFUs G. STANBROUGH, a citizen of the United States,and a resident of New York, in the county of New York and State of NewYork, have invented certain new and useful Improvements in Disks andDisk- Carriers, of which the following is a specication. Y

This invention relates to certain new and useful improvements vin disksand disk carriers for use in operative dentistry and particularly tothose disks of grinding or polishing material used to smooth, polish orburnish fillings. Heretofore these disks have been provided with asingle central aperture through which they have been attached to thecarriers by an adjusting screw, or some other securing device the saidcarriers therefore, usually comprising two or more parts, one or morebeing small and delicate, and not only liable to rust and get out oforder, but also, owing to their construction, requiring much time inadjusting the disk on the carrier and securing it in place.

It is the object of my invention, therefore, to obviate, theseobjections and to produce a disk and a carrier therefor which shall besimple and economicalin construction, not liable to rust and unable toget out of order, and to reduce the time and labor of putting the diskon the carrier and securing it in place to the minimum.

To this end my said invention consists in the combination of parts anddetails of construction, as hereinafter more specifically described andpointed out in the claims.

In the drawings, in the several gures of which like parts are similarlydesignated, Figures 1, 2 and 3 are detail views of the disk carrier.Fig. 4, represents lthe guard plate or shield of the disk. Fig. 5, is abottom view of a disk; and Fig. 6, is a top view thereof. Fig. 7, is aperspective of a disk attached to the carrier; and Fdg. 8, is a sectionat the line w, Fig. 7.

a is the shank of the carrier which may be of any usual and wellknownconstruction, having secured thereto, as by screwing, soldering orotherwise, the reduced extension b provided with the T-head cA Beforethe said extension b is secured in the shank a, however,

the lock-plate d is passedlover said extension Z7, and against theT-head c, and the coil spring c is also passed over said extension andthe shank and extension are then secured together, the spring e bearingagainst the shoulder f, formed by the head of the shank a, ad servingtopress the lock-plated firmly against the T-head c. The said lock-plateis preferably of the form shown, in Fig. l, consisting of a circularportion provided with a central aperture conforming to the congurationof the extension b over which it travels, and having laterallyprojecting diametric lugs g for a purpose hereinafter explained.

The disks h are of the usual grinding or polishing material and arepunchedfrom sheets in the usual manner. These disks are provided withthe central elongated opening i, which may be either rectangular, or asshown,

elliptical and the slits j arranged longitudinally and at right-anglesto the elongated opening i. The disk h,'is then provided with the guardplate 7g stamped or struck up from thin metal, such'as thin sheet brassor other suitable material, said guard plate consisting of a preferablycircular portion provided with a central aperture corresponding with theaperture t' in disk h and theilanged lugs Zadapted to enter and passthrough the slits j, in the disk, and for better securing theguard-plate k to the disk h, the lugs Z may be inclined inwardly beyondthe perpendicular, as shown especially in Fig. 4.

When it is desired to attach a disk to the carrier, the T-head c, isinserted through the elongated openings z' in the disk and its guardplate, k, and the spring c, and lock-plate d are slightly depressed. Thecarrier is then given a half turn and until the lugs on the disk guardplate k impinges against and engages with the lugs g on lock plate d,when the T- head c will be at right-angles to the elongated opening c'in the disk and guard-plate and will bear upon said plate la atY bothsides of the opening while the lock-plate cl and spring e serve to pressthe disk h firmly against the T- head c and the said disk is thussecurely locked in the direction of rotation. The diametric lugs g, g,of the lock-plate d when the parts are in operative relation bearagainst the edges of the protruding flanged lugs Z of the guard plate7a, the rotary power of the shank being applied to the disk h throughsuch contact.

Vhat I claim as new, and desire to secure by Letters Patent, is-

1. A disk for operative dentistry provided with a central elongatedopening and slits at either end of said central opening, and atrightangles thereto, substantially as described.

2. A disk for operative dentistry provided with a central elongatedopening and slits at either end of said central opening, and atrightangles thereto, and a guard plate provided with a central apertureto correspond with the central opening in the disk and lianged lugsentering and protruding through the slits in said disk, substantially asdescribed for the purposes set forth.

3. A disk for operative dentistry provided with a central elongatedopening and slits at either end of said central opening and atrightangles thereto, and a guard plate provided with a central apertureto correspond with the central opening in the disk and anged inwardlyinclined lugs adapted to enter the slits in said disk, substantially asdescribed for the purposes set forth.

4. Atool for operative dentistry comprising a shank having a reducedextension carrying rabaste a T-head; a lock plate comprising a circular'portion, having oppositely arranged lugs, Working over said reducedextension and held in position by a coil spring, substantially asdescribed.

5. In a tool for operative dentistry, a shank having a reduced extensioncarrying aT-head, a lock plate comprising a circular portion havingoppositely arranged lugs, working over said reduced extension and heldin position by a spring in combination with a disk provided with acentral elongated opening adapted to engage and lock the T-head of thecarrier, and slits at either end of said central opening and atright-angles thereto, a plate provided with a central aperture tocorrespond with the central opening in the disk, and flanged lugsadapted to enter the slits in said disk and engage the flanges in thelock plate, of the carrier, substantially as described.

Signed at New York,in the county of New York and State of New York, this15th day of January, A. D. 1892.

RUFUS G. STANBROUGH.

Witnesses:

FREDERIC CANAGAN, ERNEST C. WEBB.

